scholarly journals Manufacturing of Ecofriendly Bricks Using Microdust Cotton Waste

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mebrahtom Teklehaimanot ◽  
Haregeweyni Hailay ◽  
Tamrat Tesfaye
Keyword(s):  
Physical And Mechanical Properties ◽  
High Energy ◽  
Absorption Capacity ◽  
Unit Weight ◽  
Test Results ◽  
Mixing Ratios ◽  
Sound Barrier ◽  
Concrete Blocks ◽  
Failure Loads ◽  
High Energy Absorption

Large amounts of cotton microwastes are accumulated in textile industries. The cotton microdust is less to ignite and causes serious environmental problems and health hazards. This paper presents an experimental study, which investigates the potential use of cotton microdust to produce new and lightweight brick for construction industries. The physical and mechanical properties of brick mixes having different levels of cotton microdust ratio were investigated. The test results recorded for compressive strength, unit weight, and water absorption values satisfy the relevant required standards for normal construction bricks. The results show that the replacement of clay soil and cement by cotton microdust does not exhibit a sudden brittle fracture even beyond the failure loads, indicates high energy absorption capacity, reduces the unit weight dramatically, and introduces smother surface compared to the current concrete bricks in the market. The results also show that usage of cotton microdust with different mixing ratios for bricks will give light-weight composite, and brick could be an economical alternative to be used for partition of board concrete blocks and sound barrier panels.

Closed Cellular Materials for Smart Materials

2010 ◽  
Vol 638-642 ◽  
pp. 2074-2079
Author(s):  
Satoshi Kishimoto
Keyword(s):  
Internal Friction ◽  
Smart Materials ◽  
Metal Layer ◽  
Pure Aluminum ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
Cellular Materials ◽  
Plasma Sintering ◽  
Powder Particles ◽  
High Energy Absorption

New methods to fabricate a metallic closed cellular material for smart materials using an isostatic pressing and penetrating method are introduced. Powder particles of polymer or ceramics coated with a metal layer using electro-less plating were pressed into pellets and sintered at high temperature. These powder particles were sintered by spark plasma sintering (SPS) method. Closed cellular materials including polymer were fabricated by penetrating polymer into metallic foams. Many kinds of metallic closed cellular materials including different materials from that of cell walls were tried to fabricate. The physical and mechanical properties of these materials were measured. The results of the compressive tests show that this material has high-energy absorption and the result of measuring the internal friction show that the internal friction of these materials is larger than that of pure aluminum.

Impact Response of Circular Tube with Concentric Plunger

2013 ◽  
Vol 275-277 ◽  
pp. 792-798
Author(s):  
Amir Radzi Ab Ghani ◽  
Hafizi Lukman ◽  
Hafizan Hashim
Keyword(s):  
Energy Absorption ◽  
Circular Tube ◽  
High Energy ◽  
Absorption Capacity ◽  
Peak Force ◽  
Impact Response ◽  
Impact Performance ◽  
High Energy Absorption ◽  
The Impact ◽  
Initial Peak

Thin-walled tubes are generally used as impact energy absorber in various application due to their ease of fabrication and installation, high energy absorption capacity and long stroke. However, the main drawback of plain tube is the high initial peak force. A concentric plunger in the form of tapered block is proposed to overcome this shortcoming while at the same time, improving the impact performance. Static and dynamic axial crushing were performed to determine the initial peak force (IPF), crush force efficiency (CFE) and specific energy absorption (SEA) for the concentric plunger with various taper angles. It was found that the concentric plunger affected the tube impact response. Comparison with plain circular tube was carried out and it was found that the concentric plunger improved the impact response of the tube especially in term of initial peak force.

Electrical and microstructural characteristics of ZnO–Bi2O3-based varistors doped with rare-earth oxides

2001 ◽  
Vol 16 (10) ◽  
pp. 2817-2823 ◽  
Author(s):  
Nguyen The Hung ◽  
Nguyen Dinh Quang ◽  
Slavko Bernik
Keyword(s):  
Rare Earth ◽  
Energy Absorption ◽  
Threshold Voltage ◽  
Spinel Phase ◽  
High Energy ◽  
Absorption Capacity ◽  
Rare Earth Oxides ◽  
High Threshold ◽  
Energy Absorption Capacity ◽  
High Energy Absorption

ZnO-based varistor samples with a relatively high Sb2O3 to Bi2O3 ratio of 5 were fired at 1200 °C and found to have a high threshold voltage (VT) of 280 V/mm and a low energy-absorption capacity of 50 J/cm3. The introduction of rare-earth oxides (REO) increased the energy-absorption capacity of Pr6O11- and Nd2O3-doped samples to 110 J/cm3 while their threshold voltage (VT) remained slightly above 300 V/mm. Doping with Pr6O11 and Nd2O3 altered the formation of the spinel phase and significantly changed its particle size and distribution which, as a result, had a positive effect on the energy-absorption capacity of the REO-doped samples. Doping with small amounts of Pr6O11 and Nd2O3 appears to be promising for the preparation of ZnO-based varistors with a high breakdown voltage and a high energy absorption capacity.

Development of Aluminium Foam Processes and Products

2006 ◽  
Vol 519-521 ◽  
pp. 1193-1200 ◽  
Author(s):  
J. Daniel Bryant ◽  
Deborah Wilhelmy ◽  
Jacob Kallivayalil ◽  
Wei Wang
Keyword(s):  
Economies Of Scale ◽  
Structural Integrity ◽  
Physical And Mechanical Properties ◽  
Large Cell ◽  
High Energy ◽  
Metallic Foams ◽  
Aluminum Foams ◽  
Alloy Matrix ◽  
Alternative Processing ◽  
High Energy Absorption

Aluminum foams offer an attractive combination of attributes as engineering materials, such as low density, high rigidity, high energy absorption, and fire resistance. To date, however, metallic foams have achieved only a fraction of the market acceptance enjoyed by polymeric foams, owing largely to size limitations, poor uniformity and, above all, high unit costs. Methods utilizing casting (non-powder) metallurgy, while seemingly offering the potential of economies of scale, often suffer quality issues such as large cell sizes, poor uniformity and insufficient structural integrity. Many of these problems are associated with the rheology of the molten metal itself. While prior efforts to modify melt rheology through extrinsic additions of ceramic particles have been shown to be effective, the costly materials and processing paths used to create such suspensions have limited the economic attractiveness of such products. In this paper, aluminum foams produced through an alternative processing method will be described. The physical and mechanical properties in these fine (< 1 mm) celled aluminum foams will be related to their cellular structure and the properties of the aluminum alloy matrix from which they are produced.

Numerical and Experimental Investigation on Corrugation Geometry for Metallic Tubes under Lateral Loading

2018 ◽  
Vol 916 ◽  
pp. 226-231 ◽  
Author(s):  
Arameh Eyvazian ◽  
Hozhabr Mozafari ◽  
Faris Tarlochan ◽  
Abdel Magid S. Hamouda
Keyword(s):  
Energy Absorption ◽  
Cost Effective ◽  
High Energy ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
Stress Variation ◽  
Thin Walled Structures ◽  
Corrugated Tube ◽  
High Energy Absorption ◽  
Tube Structure

Energy absorption devices are being used to protect structures from severe damages and reduce injury to occupants during accidents. The integrated characteristics of crash absorption devices can be classified as high energy absorption capacity, light-weight, and cost-effective. One of the thin-walled structures which has drawn the attention of scientists is corrugated tube structure. In this paper, the effect of corrugation geometry on the crushing parameters of an aluminum corrugated tube is investigated. In this regard, different elliptical corrugation shapes were deemed and the compression response was numerically evaluated under lateral quasi-static loading. Finally, the crashworthiness parameters were extracted and compared to determine the influence of corrugation shape on the crashworthy response. Our results showed that using vertical elliptical corrugation decrease the densification point. Moreover, there is a gradual enhancement of mean crushing load by moving from the horizontal elliptical corrugations to the vertical ones. Also, by modifying of corrugation shape, the stress variation pattern changes, significantly.

scholarly journals Bending-Dominated Auxetic Materials for Wearable Protective Devices Against Impact

2020 ◽  
Author(s):  
D. Faraci ◽  
L. Driemeier ◽  
C. Comi
Keyword(s):  
High Energy ◽  
Absorption Capacity ◽  
Thin Plates ◽  
Densification Mechanism ◽  
Structured Materials ◽  
Protective Devices ◽  
Auxetic Materials ◽  
Sport Activities ◽  
Potential Applications ◽  
High Energy Absorption

AbstractAuxetic metamaterials have high energy absorption capacity and indentation resistance, due to their significant densification mechanism during compression. This study investigates the performance of structured materials in layered thin plates, with potential applications in wearable protective devices for sport activities. Two different 3D lattices, conventional and re-entrant honeycomb, are studied in detail and their dynamic behaviour is compared with that of a 2D auxetic lattice. Initially, the equivalent elastic properties of the proposed geometries are investigated at varying equivalent densities. Then a new lightweight solution of a sandwich structure with an auxetic metamaterial core is proposed for possible application to facial protective masks. Numerical impact analyses of the problem show the potential benefit of the present proposal with respect to traditional mask geometries.

scholarly journals Effect of Fiber Mat Density and Crushing Mechanism on the Energy Absorption Capacity of GFRP Crashworthy Tubes

2019 ◽  
Vol 8 (9S3) ◽  
pp. 297-301 ◽  
Keyword(s):  
Energy Absorption ◽  
Deformation Mechanism ◽  
Theoretical Calculations ◽  
Peak Load ◽  
High Energy ◽  
Constant Load ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
High Energy Absorption ◽  
Energy Absorbing

The aim of this study is to examine the effect of fiber mat’s density and deformation mechanism of tubes with and without die compression. In this study a new mode of deformation mechanism of density graded GFRP circular tube is examined when they are subjected to axial compression on to a die and without die to examine its energy absorbing capacity. Theoretical calculations were made to predict the crushing stress of different specimens. It is observed that increasing density of fiber increases energy absorption value but decreases the specific energy absorption and the die could trigger progressive crushing additionally decreasing peak load. Here the compressed tube wall is compelled to be deformed towards the end of compression die with a little range of bending curvature which was forced by the radius of the die at high crushing stress and the major part of the deformation takes place at a nearly constant load, which leads to high energy absorption capacity. Comparison between theoretical prediction values by derived equations and the experimental results shows good correlation.

Novel Design of Impact Attenuator for an 'Eco Challenge' Car

2012 ◽  
Vol 165 ◽  
pp. 237-241 ◽  
Author(s):  
Amir Radzi Ab Ghani ◽  
Ramlan Kasiran ◽  
Mohd Shahriman Adenan ◽  
Mohd Haniff Mat ◽  
Rizal Effendy Mohd Nasir ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Impact Energy ◽  
High Energy ◽  
Absorption Capacity ◽  
Flat Plates ◽  
Final Design ◽  
High Energy Absorption ◽  
Energy Absorbing ◽  
Long Stroke ◽  
The Impact

Thin-walled metallic tubular structures are generally used as impact energy absorber in automotive structures due to their ease of fabrication and installation, high energy absorption capacity and long stroke. However, unlike a normal passenger car where the impact energy can be distributed throughout the whole structure, the impact energy absorbing system of an Eco-Challenge car is confined within a limited space on the front bulkhead. The challenge is to develop an impact attenuator system that can effectively absorb the impact energy within the given space and fulfil the specified rate of deceleration. This new design utilized the standard Aluminium 6063 circular tubes, cut and welded into specific configurations i.e. stacked toroidal tubes with central axial tube sandwiched between two flat plates. Two configurations were investigated; circular and square toroids. Explicit non-linear FEA software was used to determine the impact response i.e. energy absorption, impact force and rate of deceleration. Both configurations showed promising results but the configuration that can be readily fabricated was chosen as the final design.

Mechanical Properties and Manufacturing Process of a Closed-Cell Cellular Metal Based on Cubic Structure

2015 ◽  
Author(s):  
Xiaobing Dang ◽  
Kai He ◽  
Qiyang Zuo ◽  
Jiuhua Li ◽  
Ruxu Du
Keyword(s):  
Energy Absorption ◽  
High Energy ◽  
Absorption Capacity ◽  
Interactive Effects ◽  
Energy Absorption Capacity ◽  
Cellular Metal ◽  
Closed Cell ◽  
Cubic Structure ◽  
High Energy Absorption ◽  
The Individual

It is well known that cellular metal is an ideal structure used in transportation passive safety field for its low density and high energy absorption capacity. In this paper, a kind of regular cellular metal based on cubic structure is proposed. The cubic cells are manufactured through sheet metal stamping process. Then the cells could be bonded together by adhesive to form the cellular structure. The compressive properties of the cellular metal are studied by experiments. The dynamic behaviors are studied by numerical simulations. To distinguish the individual and interactive effects on the energy absorption capacity, a full factorial Design of Experiment with sixteen configurations is carried out based on the four parameters that are essential to the design of cellular metal. The effects of impact velocity on crushing deformation are analyzed. It has been shown that the regular cellular metal based on cubic structure will have a wide application in industry.

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